CN112661443A - High-performance economical asphalt mixture and construction method thereof - Google Patents

High-performance economical asphalt mixture and construction method thereof Download PDF

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CN112661443A
CN112661443A CN202110056419.9A CN202110056419A CN112661443A CN 112661443 A CN112661443 A CN 112661443A CN 202110056419 A CN202110056419 A CN 202110056419A CN 112661443 A CN112661443 A CN 112661443A
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asphalt
aggregate
asphalt mixture
mineral
thin layer
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CN112661443B (en
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邓星鹤
王志祥
王旺
肖凤
吴传海
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Guangdong Hualu Transport Technology Co ltd
Guangdong Jiaoke Technology R & D Co Ltd
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Abstract

The invention discloses a high-performance economical asphalt mixture and a construction method, which are used for preparing a wearing thin layer of a pavement, and comprise high-viscoelasticity modified asphalt, mineral aggregate and a stabilizer, wherein the oilstone ratio of the high-viscoelasticity modified asphalt to the mineral aggregate is 6.0-7.5%, and the stabilizer is 0.3-0.6% of the asphalt mixture; during construction, the asphalt mixture is spread on the treated base surface and rolled. The wearing thin layer paved by the asphalt mixture has the paving thickness of 1 cm-3 cm, has the advantages of saving cost and resources, is 30% lower than the price of similar materials, and is 50% lower than stones of similar products; the invention saves the consumption of manpower, machinery, fuel and the like in the aspects of stone heating, mixture production, mixture transportation, pavement rolling and the like, directly reduces the carbon emission by 70 percent, reduces the pollution by 50 percent, and reduces the noise by 5 to 10dB compared with the traditional pavement by specially designed special textures of the paved pavement.

Description

High-performance economical asphalt mixture and construction method thereof
Technical Field
The invention relates to the field of road engineering, in particular to a high-performance economical asphalt mixture and a construction method thereof.
Background
By 2019, the highway in China has the traffic mileage of over 14 kilometers, wherein the asphalt pavement accounts for more than 90%. The asphalt pavement wearing layer is the first defense line for ensuring the performance of the pavement, not only directly bears the load of a vehicle, but also is influenced by water and temperature environments, the safety, smoothness and comfort of the vehicle are directly influenced by the performance of the asphalt pavement wearing layer, and higher requirements are provided for the material of the road wearing layer.
However, the existing asphalt pavement wearing layer in China has some problems: 1. the structural design of the wearing layer is not matched with the layer function positioning, and the contradiction between the design of the over-thick wearing layer and the shortage of high-quality stone supply is extremely outstanding; 2. the bridge and tunnel pavement layer structure is conservative in design, and the upper layer structure in the asphalt of the adjacent roadbed section is excessively migrated, so that the self weight of the bridge is increased, the selection of a later pavement layer maintenance scheme is limited, and meanwhile, unnecessary construction cost of engineering construction is increased, and resource waste is caused; 3. the contradiction between water-tight and anti-rutting and anti-skid of the wearing layer is not effectively solved all the time, the phenomena of high-temperature rutting and water damage occur occasionally, and the problem of insufficient anti-skid durability troubles the road management and maintenance department for a long time; 4. maintenance surface layer materials such as fog seal, slurry seal, micro-surfacing and the like have poor durability, the Novachip technology of the ultra-thin wearing layer is monopolized by foreign material manufacturers for a long time, the quality of the ultra-thin wearing layer materials is uneven, matched complete construction equipment is not provided, and a nationwide approved, mature and systematic application technical system and standard are not formed.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a high-performance economical asphalt mixture material which can save resources, reduce cost and has excellent performance and a construction method thereof.
In order to realize the technical purpose, the scheme of the invention is as follows: the high-performance economical asphalt mixture is used for preparing a wearing thin layer of a pavement and comprises high-viscoelasticity modified asphalt, mineral aggregate and a stabilizer, wherein the oilstone ratio of the high-viscoelasticity modified asphalt to the mineral aggregate is 6.0-7.5%, the stabilizer is lignin fiber, and the stabilizer is 0.3-0.6% of the asphalt mixture.
Preferably, the high viscoelastic modified asphalt is prepared from 90-95: 4% of matrix asphalt, 4-10% of composite modifier, 0.3-0.6% of sulfur-containing compound and 0.1-0.3% of anti-aging agent by mass percentage;
the matrix asphalt is No. 70 road petroleum asphalt, or No. 90 road petroleum asphalt, or No. 110 road petroleum asphalt;
the composite modifier comprises the following components in percentage by weight: 92-97% of styrene-butadiene-styrene block copolymer, 2-4% of terpene resin and 0.2-0.5% of high aromatic oil, wherein the performance indexes of the high viscoelasticity modified asphalt are shown in Table 1:
TABLE 1 Properties of highly viscoelastic modified asphalts
Figure BDA0002900797280000021
Figure BDA0002900797280000031
Preferably, the mineral aggregate is formed by combining coarse aggregate, fine aggregate and mineral powder, wherein the coarse aggregate is one or more of firm and wear-resistant basalt, diabase and amphibole with the specification of 5-10mm, the fine aggregate is one or more of limestone, basalt, diabase and amphibole, and the mineral powder is one or more of limestone or copper tailing powder; the requirements of the coarse and fine aggregate grading technique are shown in table 2:
TABLE 2 grading of coarse and fine aggregates
Figure BDA0002900797280000032
Preferably, when the thickness of the abrasion thin layer is 1.0-1.5cm, the mineral aggregate consists of 70-85% of 5-8mm coarse aggregate, 15-30% of 0-3mm fine aggregate and 5-8% of mineral powder by mass percentage; the oil-stone ratio of the high viscoelastic modified asphalt to the mineral aggregate is 6.5-7.5%.
Preferably, when the thickness of the abrasion thin layer is 2.0-3.0cm, the mineral aggregate consists of 70-85% of 5-10mm coarse aggregate, 10-20% of 0-3mm fine aggregate and 7-10% of mineral powder by mass percentage; the oil-stone ratio of the high viscoelastic modified asphalt to the mineral aggregate is 6.0-6.5%; the stabilizer is 0.3-0.6% of the asphalt mixture.
Preferably, the coarse aggregate has a needle-flake particle content of not more than 12%, and the needle-flake particle determination criterion is: the ratio of the maximum length to the minimum thickness dimension of the aggregate particles is greater than 2.5 times.
A construction method adopts a high-performance economical asphalt mixture and comprises the following specific steps:
s1, preparing, namely conveying the coarse aggregate and the fine aggregate to a rotary kiln through a belt according to a ratio, heating for 10-15S to 180-190 ℃, and putting into a mixing plant for secondary screening;
mixing the coarse aggregate and the fine aggregate after secondary screening with the mineral powder and the stabilizer according to a production ratio, simultaneously spraying and mixing the high-viscosity elastic modified asphalt heated to 160-170 ℃ according to the ratio, and mixing for 45-50s to obtain an asphalt mixture;
wherein when the thickness of the wearing thin layer is 1.0-1.5cm, the grading type is HET-10; when the thickness of the abrasion thin layer is 2.0-3.0cm, the grading type is HET-20, and the grading range of the mineral materials in the engineering is shown in a table 3;
TABLE 3 mineral aggregate grading Range in engineering
Grading type 13.2 9.5 8.0 4.75 2.36 1.18 0.6 0.3 0.15 0.075
HET-20 100 90-100 70-85 28-40 20-30 14-25 12-18 10-18 9-16 8-13
HET-10 100 40-70 15-30 10-25 12-18 8-18 5-16 5-10
S2, preprocessing, cleaning and treating diseases of the lower bearing layer, and ensuring that the lower bearing layer is flat, neat and free of a floating layer;
s3, spraySpreading waterproof adhesive layer with spreading machine, wherein the spreading amount of the high-performance emulsified asphalt is 0.3-0.5kg/m2Curing for 0.5-1h, wherein the spraying amount of the polymer asphalt base material is 0.3-0.6kg per square meter, and the curing is 2-3 h;
s4, paving, namely paving and molding the asphalt mixture prepared in the step S1 once by adopting an asphalt paver, wherein the paving speed is controlled to be 4.0-6.0 m/min;
s5, rolling, wherein the temperature of the asphalt mixture is not lower than 150 ℃ during initial rolling, a 12-13t double-steel-wheel road roller is adopted for rolling for 2-3 times, and the rolling speed is controlled at 3-6 Km/h;
and S6, cooling, paving the pavement, and cooling to below 60 ℃ to open the traffic.
Preferably, the pretreatment in step S2 further includes a crack repair surplus asphalt treatment: heating and scraping the reflective crack sealing material before construction, and spreading stone powder after scraping;
marking and pit processing: and (4) clearing the marking line by using a marking cleaner, clearing the marking line by using a sweeper after clearing, and repairing the pit slot according to the standard requirement.
Preferably, in the step S4, the paving temperature of the asphalt mixture is controlled to be above 170 ℃, the paving speed is controlled to be 4.0-6.0m/min, and a small amount of paving defects are manually and timely repaired and compacted by hot materials.
Preferably, in the rolling of step S5, when the thickness of the abraded thin layer is 1.0-1.5cm, 2 times of static pressure are adopted to complete compaction;
when the thickness of the wearing thin layer is 2.0-3.0cm, the initial pressure adopts forward vibration and backward static pressure, and the combined pressure and the final pressure are totally static pressure for 2 times.
The invention has the advantages that:
1. the waterproof adhesive layer is made of a targeted waterproof adhesive layer material aiming at different base planes, has the characteristics of strong adhesive property and low construction cost, and stabilizes a high-performance wearing layer on the base planes, so that the wearing layer is high in quality and long in service life;
2. the construction is simple and cheap, and the two steel wheel road rollers can roll for 2-3 times; the road surface can be opened when the temperature of the road surface is lower than 60 ℃, and the road surface can be opened more quickly than a common asphalt road surface;
3. the abrasion thin layer has excellent high-temperature stability, water stability, fatigue resistance, ageing resistance and other performances, and the performances are superior to those of the existing abrasion thin layer on the market;
4. the method has the characteristics of strong applicability, and can be used for paving bridge deck pavement tunnels and normal roadbed sections of expressways and municipal roads; the model of 2.0-3.0cm is HET-20, the original upper layer can be directly replaced in a newly-built high speed, the service performance and the durability are better, and the light weight of a bridge pavement layer and the effective increase of tunnel clearance are better realized;
5. the wearing thin layer paved by the asphalt mixture has the paving thickness of 1.0 cm-3.0 cm, has the advantages of saving cost and resources, is 30% lower than the price of similar materials, and is 50% lower than stones of similar products; the invention saves the consumption of manpower, machinery, fuel and the like in the aspects of stone heating, mixture production, mixture transportation, pavement rolling and the like, directly reduces the carbon emission by 70 percent, reduces the pollution by 50 percent, and reduces the noise by 5 to 10dB compared with the traditional pavement by specially designed special textures of the paved pavement.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The specific embodiment of the invention is a high-performance economical asphalt mixture which is used for preparing a wearing thin layer of a pavement and comprises high-viscoelasticity modified asphalt, mineral aggregate and a stabilizer, wherein the oilstone ratio of the high-viscoelasticity modified asphalt to the mineral aggregate is 6.0-7.5%, and the stabilizer is 0.3-0.6% of the asphalt mixture;
the mineral aggregate is formed by combining coarse aggregate, fine aggregate and mineral powder, wherein the coarse aggregate and the fine aggregate are one or more of firm and wear-resistant basalt, diabase or amphibole, and the mineral powder is one or more of limestone or copper tailing powder.
The high viscoelastic modified asphalt is prepared from 90-95:4 mass percent of matrix asphalt, 4-10 mass percent of composite modifier, 0.3-0.6 mass percent of sulfur-containing compound and 0.1-0.3 mass percent of anti-aging agent; the matrix asphalt is No. 70 road petroleum asphalt, or No. 90 road petroleum asphalt, or No. 110 road petroleum asphalt;
the composite modifier comprises the following components in percentage by weight: 92-97% of styrene-butadiene-styrene block copolymer, 2-4% of terpene resin and 0.2-0.5% of high aromatic oil, wherein the anti-aging agent is benzotriazole compound, more specifically 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole. The performance indexes of the high viscoelastic modified asphalt are shown in table 1:
TABLE 1 Properties of highly viscoelastic modified asphalts
Figure BDA0002900797280000071
The mineral aggregate is formed by combining coarse aggregate, fine aggregate and mineral powder, wherein the coarse aggregate is one or more of firm and wear-resistant basalt, diabase and amphibole with the specification of 5-10mm, and the fine aggregate is one or more of limestone, basalt, diabase and amphibole, as shown in Table 2; the coarse aggregate grading of table 2 was augmented with 8.0mm non-standard screens to define its grading to form a stronger skeletal compact structure. The performance requirements of the coarse and fine aggregates are shown in tables 3 and 4; wherein the mineral powder (also called as filler) is one or more of limestone or copper tailings powder, as shown in Table 5. The requirements of the coarse and fine aggregate grading technique are shown in table 2:
TABLE 2 grading of coarse and fine aggregates
Figure BDA0002900797280000081
TABLE 4 coarse aggregate quality specifications
Figure BDA0002900797280000082
TABLE 5 Fine aggregate quality specifications
Test items Unit of Technical requirements Test method
Apparent relative density of not less than - 2.5 T 0328
Firmness (> 0.3mm portion) of not more than 12 T 0340
Sand equivalent of not less than 60 T 0334
Methylene blue value of not more than g/kg 2.5 T 0349
Angular property of not less than s 35 T 0345
TABLE 6 technical requirements for quality of ore powder
Figure BDA0002900797280000091
When the thickness of the wearing thin layer is 1.0-1.5cm, the mineral aggregate consists of 70-85% of 5-8mm coarse aggregate, 15-30% of 0-3mm fine aggregate and 5-8% of mineral powder by mass percentage; the oil-stone ratio of the high viscoelastic modified asphalt to the mineral aggregate is 6.5-7.5%.
When the thickness of the wearing thin layer is 2.0-3.0cm, the mineral aggregate consists of 70-85% of 5-10mm coarse aggregate, 10-20% of 0-3mm fine aggregate and 7-10% of mineral powder by mass percentage; the oil-stone ratio of the high viscoelastic modified asphalt to the mineral aggregate is 6.0-6.5%; the stabilizer is 0.3-0.6% of the asphalt mixture.
The content of the needle-shaped flaky particles of the coarse aggregate is not more than 12%, and the judgment standard of the needle-shaped flaky particles is as follows: the ratio of the maximum length to the minimum thickness dimension of the aggregate particles is greater than 2.5 times.
A construction method comprises the following specific steps according to a high-performance economical asphalt mixture:
s1, preparing, namely conveying the coarse aggregate and the fine aggregate to a rotary kiln through a belt according to a ratio, heating for 10-15S to 180-190 ℃, and putting into a mixing plant for secondary screening;
mixing the coarse aggregate and the fine aggregate after secondary screening with the mineral powder and the stabilizer according to a production ratio, simultaneously spraying and mixing the high-viscosity elastic modified asphalt heated to 160-170 ℃ according to the ratio, and mixing for 45-50s to obtain an asphalt mixture; wherein when the thickness of the wearing thin layer is 1.0-1.5cm, the grading type is HET-10; when the thickness of the abrasion thin layer is 2.0-3.0cm, the grading type is HET-20, and the grading range of the mineral materials in the engineering is shown in a table 3;
TABLE 3 mineral aggregate grading Range in engineering
Figure BDA0002900797280000101
TABLE 7 asphalt mixture design index requirements
Figure BDA0002900797280000102
TABLE 8 technical quality index requirements for asphalt mixtures
Figure BDA0002900797280000103
S2, preprocessing, cleaning and treating diseases of the lower bearing layer, and ensuring that the lower bearing layer is flat, neat and free of a floating layer;
s3, spreading a waterproof bonding layer by a spreading machine, wherein the spreading amount of the high-performance emulsified asphalt is 0.3-0.5kg/m2Curing for 0.5-1h, wherein the spraying amount of the polymer asphalt base material is 0.3-0.6kg per square meter, and the curing is 2-3 h; one part of the sprayed waterproof bonding material permeates into the wearing thin layer, and the other part permeates into the original pavement, so that no blank is left on the original pavement, and the high-performance wearing thin layer is ensured to be bonded and not fall off; the technical requirements for the waterproof tie layer material are shown in table 9:
TABLE 9 technical requirements for waterproof bonding layer materials
Test items Unit of Technical requirements Test method
Quality of spray kg/m2 0.3-0.6 -
Appearance of the product - Black liquid Visualization
Standard viscosity, 25 deg.C s 8-20 T 0625
Engra viscosity, 25 deg.C s 5-10 T 0621
Storage stability test of 24h or less 0.5 T 0656
Content of evaporation residue of not less than 50 T0651
The residual quantity on the sieve (1.18mm) is not less than 0.1 T 0652
S4, paving, namely paving and molding the asphalt mixture prepared in the step S1 once by adopting an asphalt paver, wherein the paving speed is controlled to be 4.0-6.0 m/min;
s5, rolling, wherein the temperature of the asphalt mixture is not lower than 150 ℃ during initial rolling, a 12-13t double-steel-wheel road roller is adopted for rolling for 2-3 times, and the rolling speed is controlled at 3-6 km/h;
and S6, cooling, paving the pavement, and cooling to below 60 ℃ to open the traffic.
In the pretreatment of the step S2, the method further comprises the following steps of: heating and scraping the reflective crack sealing material before construction, and spreading stone powder after scraping; marking and pit processing: and (4) clearing the marking line by using a marking cleaner, clearing the marking line by using a sweeper after clearing, and repairing the pit slot according to the standard requirement.
In the step S4, the paving temperature of the asphalt mixture is controlled to be above 170 ℃, the paving speed is controlled to be 4.0-6.0m/min, and a small amount of paving defects are manually and timely repaired and compacted by adopting hot materials.
In the step S5, in the rolling, when the thickness of the worn thin layer is 1.0-1.5cm, 2 times of static pressure is adopted to complete compaction; when the thickness of the wearing thin layer is 2.0-3.0cm, the initial pressure adopts forward vibration and backward static pressure, and the combined pressure and the final pressure are totally static pressure for 2 times.
The paved road surface is subjected to traffic acceptance detection after 1 week of open traffic, and the actual project of the engineering traffic acceptance is shown in the following table 10.
TABLE 10 measurement project
Figure BDA0002900797280000121
The biggest difference between the high-viscidity and elasticity modified asphalt and the high-viscidity and elasticity modified asphalt sold in the market is that the asphalt has high viscosity and construction workability, namely, the asphalt mixture produced has better construction workability (the kinematic viscosity at 150 ℃ is less than 3pa.s) under the condition of high viscosity (the dynamic viscosity at 60 ℃ is more than 35 pa.s).
In the following examples, a high viscoelasticity modified asphalt having a formulation A of 94.5% of a base asphalt, 5% of a composite modifier, 0.4% of a sulfur compound and 0.1% of an anti-aging agent was used, and the dynamic viscosity at 60 ℃ was 55 kpa.s and the kinematic viscosity at 150 ℃ was 2.1pa.s in the high viscoelasticity modified asphalt of formulation A shown in Table 0.
TABLE 11 high viscoelastic modified asphalt characteristics for formulation A
Figure BDA0002900797280000131
Example 1
The high-performance asphalt mixture is used as an upper layer, the number of the abrasion thin layer is HET-20, the paving thickness is 2.5cm, the mineral aggregate is composed of 5-10mm diabase coarse aggregate, 0-3mm diabase fine aggregate and limestone mineral powder, and the mass fraction is 75%: 16%: 9%, the design grading is as in table 12 below; adopting high-viscosity modified asphalt, the index meets the table 1, and the oilstone ratio is 6.3%; flocculent lignin fiber is used as a stabilizer, and the mass fraction of the flocculent lignin fiber is 0.3 percent of the total mass of the asphalt mixture; the bonding layer adopts high-performance modified emulsified asphalt.
TABLE 12 HET-20 design grading
Figure BDA0002900797280000132
The preparation method of the high-performance economical wearing layer asphalt mixture comprises the following steps:
(1) firstly, mixing coarse aggregates and fine aggregates according to a target mixing proportion, conveying the mixture to a rotary kiln cave through a belt, heating for 12s to 185 ℃, and preheating special high-viscoelasticity modified asphalt to 165 ℃; (2) and (3) carrying out secondary screening on the aggregate heated by the rotary kiln through a mixing plant, mixing again according to the production mixing proportion after screening, mixing the ore powder, the stabilizer and the special high-viscoelasticity modified asphalt together for 48s, and mixing to obtain the high-performance asphalt mixture. The volume index of the asphalt mixture is as follows 13:
TABLE 13 HET-20 volume index of the blends
Test items Unit of Technical requirements Test method
Marshall test piece size mm ф101.6mm×63.5mm T0702
Number of compaction strokes of Marshall test piece - Compacting both sides 75 times T0702
Void ratio VV 4.0 T 0705
Mineral aggregate void fraction VMA 17.3 T 0705
Asphalt saturation VFA 78.5 T 0705
Marshall stability kN 11.5 T 0709
Flow value mm 4.5 T 0709
Loss of binder in Schrenberg asphalt leakage test 0.08 T 0732
The concrete construction process is as follows: for a newly-built expressway, a lower bearing layer is cleaned, and the surface is guaranteed to be flat and clean without accumulated water or floating dust; uniformly spreading waterproof bonding material by special equipment, wherein the spreading amount of the high-performance emulsified asphalt is 0.3-0.5kg/m2Curing for 1h, wherein the bonding strength between the base surface and the base surface is 0.55Mpa (25 ℃);
the paving temperature of the hot asphalt mixture is controlled at 170 ℃, a paver is adopted to pave and form the hot asphalt mixture once, and the paving speed is controlled at about 5.0 km/h; 2, 13t double-steel-wheel road rollers are equipped, forward vibration and backward static pressure is adopted for initial pressure, the total static pressure of the re-pressing and the final pressure is 2 times, and the rolling speed is 3-5 m/min; after rolling, the road surface is cooled to below 60 ℃ to open traffic.
The asphalt mixture construction process and post-construction detection indexes are as follows 14:
TABLE 14 HET-20 mixture Properties and post-construction testing indexes
Figure BDA0002900797280000151
Example 2
The high-performance asphalt mixture is used as an upper layer, the number of the abrasion thin layer is HET-10, the paving thickness is 1.5cm, the mineral aggregate is composed of 5-10mm basalt coarse aggregates, 0-3mm basalt fine aggregates and limestone mineral powder, and the mass fraction is 73%: 21%: 6%, the design grading is as in table 15 below; adopting high-viscosity modified asphalt, the index meets the table 1, and the oilstone ratio is 7.0 percent; flocculent lignin fiber is used as a stabilizer, and the mass fraction of the flocculent lignin fiber is 0.4 percent of the total mass of the asphalt mixture;
TABLE 15 HET-10 bituminous mixture mineral aggregate gradation
Figure BDA0002900797280000152
The preparation method of the asphalt mixture comprises the following steps: (1) firstly, mixing coarse aggregates and fine aggregates according to a target mixing proportion, conveying the mixture to a rotary kiln cave through a belt, heating for 15s to 185 ℃, and preheating special high-viscoelasticity modified asphalt to 170 ℃; (2) and (3) carrying out secondary screening on the aggregate heated by the rotary kiln through a mixing plant, mixing again according to the production mixing proportion after screening, mixing the mineral powder, the fiber stabilizer and the special high-viscosity and elastic modified asphalt together for 50s, and mixing to obtain the high-performance asphalt mixture. (ii) a
The volume indexes of the high-performance economic wearing layer asphalt mixture are as follows 16:
TABLE 16 HET-10 batch volume index
Test items Unit of Technical requirements Test method
Marshall test piece size mm ф101.6mm×63.5mm T0702
Number of compaction strokes of Marshall test piece - Compacting both sides 75 times T0702
Void ratio VV 4.2 T 0705
Mineral aggregate void fraction VMA 18.3 T 0705
Asphalt saturation VFA 79.5 T 0705
Marshall stability kN 12.5 T 0709
Flow value mm 4.0 T 0709
Loss of binder in Schrenberg asphalt leakage test 0.09 T 0732
The concrete construction process is as follows: heating the reflection crack before construction at high operation speed, and spreading stone powder after scraping; the marked lines are cleared by a small milling machine, and then cleared by a mountain cat sweeper, so that the marked lines are cleared in place; spreading high molecular asphalt base waterproof adhesive with special equipment, uniformly spreading, curing for 2-3 hr, with spreading amount of 0.4kg/m2The bonding strength with the basal plane is 0.50Mpa (25 ℃); the paving temperature of the hot asphalt mixture is controlled at 175 ℃, a paver is adopted to pave for one-time forming, the paving speed is controlled at about 5.0km/h, and a small amount of paving defects are manually and timely repaired and compacted by adopting hot materials; 2, 13t double-steel-wheel road rollers are equipped, static pressure is carried out for 2 times, and rolling speed is 5 m/min; after rolling, the road surface is cooled to below 60 ℃ to open traffic.
The asphalt mixture construction process and post-construction detection indexes are as follows 17:
TABLE 17 HET-10 mixture Properties and post-construction testing indexes
Figure BDA0002900797280000171
According to the fact cases, the application provides a scientific, efficient and economical maintenance and repair new technology, the high-performance wearing layer asphalt mixture has excellent high-temperature resistance, strong water damage resistance, low-temperature crack resistance, good fatigue resistance, good skid resistance and durability, and the traveling is smooth, quiet and comfortable; the waterproof bonding layer material has excellent performance, convenient construction and excellent bonding performance, and the high-performance wearing layer is stabilized on the base surface, so that the high quality and long service life of the wearing layer are ensured; the preparation and construction process of the asphalt mixture is simple, the construction is cheap, the cost is saved, and the resources are saved; the applicability is strong, and the thickness of paving is 1 ~ 3cm all can, and the bridge deck pavement tunnel of highway, town road paves, normal road base section all should.
The asphalt mixture adopts special high-volume high-viscoelasticity modified asphalt as a cementing material, and can stably bond stone materials together, so that the whole asphalt mixture has better mechanical property; the special enhanced skeleton compactness mineral aggregate gradation is adopted, and the mucilage is fully filled among the coarse aggregates to form a compact, uniform and stable embedding and extruding structure, so that the asphalt mixture not only has good anti-sliding and noise-reducing functions, but also has good water damage resistance; the fiber stabilizer is used for reinforcing, dispersing, adsorbing and stabilizing, so that the asphalt-stone-fiber forms a stable net structure, the mixture has good flexibility, high-temperature rutting resistance, low-temperature crack resistance, fatigue resistance and durability, and the asphalt-stone-fiber composite material has better performance and longer service life compared with a conventional wearing layer or thin layer material.
The waterproof adhesive layer is made of a targeted waterproof adhesive layer material aiming at different base planes, has the characteristics of strong adhesive property and low construction cost, and stabilizes a high-performance wearing layer on the base planes, so that the wearing layer is high in quality and long in service life; the construction is simple and cheap, and the two steel wheel road rollers can roll for 2-3 times; the road surface can be opened when the temperature of the road surface is lower than 60 ℃, and the road surface can be opened more quickly than a common asphalt road surface; the method has the characteristics of strong applicability, and can be used for paving bridge deck pavement tunnels and normal roadbed sections of expressways and municipal roads; the model of 2.0-3.0cm is HET-20, the original upper layer can be directly replaced in a newly-built high speed, the service performance and the durability are better, and the light weight of a bridge pavement layer and the effective increase of tunnel clearance are better realized; the paving thickness is 1.0 cm-3.0 cm, the method has the advantages of cost saving and resource saving, the price is 30% lower than that of similar materials, and the stone is saved by 50% compared with that of similar products; the invention saves the consumption of manpower, machinery, fuel and the like in the aspects of stone heating, mixture production, mixture transportation, pavement rolling and the like, directly reduces the carbon emission by 70 percent, reduces the pollution by 50 percent, and reduces the noise by 5 to 10dB compared with the traditional pavement by specially designed special textures of the paved pavement.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims (10)

1. A high-performance economical asphalt mixture is used for preparing an abrasion thin layer of a pavement and is characterized in that: the asphalt comprises high-viscoelasticity modified asphalt, mineral aggregate and a stabilizer, wherein the oilstone ratio of the high-viscoelasticity modified asphalt to the mineral aggregate is 6.0-7.5%;
the stabilizer is lignin fiber, and the stabilizer is 0.3-0.6% of the asphalt mixture.
2. The high performance economical asphalt mixture according to claim 1, characterized in that: the high viscoelastic modified asphalt is prepared from 90-95:4 mass percent of matrix asphalt, 4-10 mass percent of composite modifier, 0.3-0.6 mass percent of sulfur-containing compound and 0.1-0.3 mass percent of anti-aging agent;
the matrix asphalt is No. 70 road petroleum asphalt, or No. 90 road petroleum asphalt, or No. 110 road petroleum asphalt;
the composite modifier comprises the following components in percentage by weight: 92-97% of styrene-butadiene-styrene block copolymer, 2-4% of terpene resin and 0.2-0.5% of high aromatic oil, wherein the performance indexes of the high viscoelasticity modified asphalt are shown in Table 1:
TABLE 1 Properties of highly viscoelastic modified asphalts
Figure FDA0002900797270000011
Figure FDA0002900797270000021
3. The high performance economical asphalt mixture according to claim 1, characterized in that: the mineral aggregate is formed by combining coarse aggregate, fine aggregate and mineral powder, wherein the coarse aggregate is one or more of firm and wear-resistant basalt, diabase and amphibole with the specification of 5-10mm, the fine aggregate is one or more of limestone, basalt, diabase and amphibole, and the mineral powder is one or more of limestone or copper tailing powder; the requirements of the coarse and fine aggregate grading technique are shown in table 2:
TABLE 2 grading of coarse and fine aggregates
Figure FDA0002900797270000022
4. The high performance economical asphalt mixture according to claim 1, characterized in that: when the thickness of the wearing thin layer is 1.0-1.5cm, the mineral aggregate consists of 70-85% of 5-8mm coarse aggregate, 15-30% of 0-3mm fine aggregate and 5-8% of mineral powder by mass percentage;
the oil-stone ratio of the high viscoelastic modified asphalt to the mineral aggregate is 6.5-7.5%.
5. The high performance economical asphalt mixture according to claim 1, characterized in that: when the thickness of the wearing thin layer is 2.0-3.0cm, the mineral aggregate consists of 70-85% of 5-10mm coarse aggregate, 10-20% of 0-3mm fine aggregate and 7-10% of mineral powder by mass percentage; the oil-stone ratio of the high viscoelastic modified asphalt to the mineral aggregate is 6.0-6.5%; the stabilizer is 0.3-0.6% of the asphalt mixture.
6. The high performance economical asphalt mixture according to claim 1, characterized in that: the content of the needle-shaped flaky particles of the coarse aggregate is not more than 12%, and the judgment standard of the needle-shaped flaky particles is as follows: the ratio of the maximum length to the minimum thickness dimension of the aggregate particles is greater than 2.5 times.
7. A construction method is characterized in that: the high-performance economical asphalt mixture according to any one of claims 1 to 6 is adopted, and the specific steps are as follows:
s1, preparing, namely conveying the coarse aggregate and the fine aggregate to a rotary kiln through a belt according to a ratio, heating for 10-15S to 180-190 ℃, and putting into a mixing plant for secondary screening;
mixing the coarse aggregate and the fine aggregate after secondary screening with the mineral powder and the stabilizer according to a production ratio, simultaneously spraying and mixing the high-viscosity elastic modified asphalt heated to 160-170 ℃ according to the ratio, and mixing for 45-50s to obtain an asphalt mixture;
wherein when the thickness of the wearing thin layer is 1.0-1.5cm, the grading type is HET-10; when the thickness of the abrasion thin layer is 2.0-3.0cm, the grading type is HET-20, and the grading range of the mineral materials in the engineering is shown in a table 3;
TABLE 3 mineral aggregate grading Range in engineering
Figure FDA0002900797270000031
S2, preprocessing, cleaning and treating diseases of the lower bearing layer, and ensuring that the lower bearing layer is flat, neat and free of a floating layer;
s3, spreading a waterproof bonding layer by a spreading machine, wherein the spreading amount of the high-performance emulsified asphalt is 0.3-0.5kg/m2Curing for 0.5-1h, wherein the spraying amount of the polymer asphalt base material is 0.3-0.6kg per square meter, and the curing is 2-3 h;
s4, paving, namely paving and molding the asphalt mixture prepared in the step S1 once by adopting an asphalt paver, wherein the paving speed is controlled to be 4.0-6.0 m/min;
s5, rolling, wherein the temperature of the asphalt mixture is not lower than 150 ℃ during initial rolling, a 12-13t double-steel-wheel road roller is adopted for rolling for 2-3 times, and the rolling speed is controlled at 3-6 km/h;
and S6, cooling, paving the pavement, and cooling to below 60 ℃ to open the traffic.
8. The construction method according to claim 7, wherein: in the pretreatment of the step S2, the method further comprises the following steps of: heating and scraping the reflective crack sealing material before construction, and spreading stone powder after scraping;
marking and pit processing: and (4) clearing the marking line by using a marking cleaner, clearing the marking line by using a sweeper after clearing, and repairing the pit slot according to the standard requirement.
9. The construction method according to claim 7, wherein: in the step S4, the paving temperature of the asphalt mixture is controlled to be above 170 ℃, the paving speed is controlled to be 4.0-6.0m/min, and a small amount of paving defects are manually and timely repaired and compacted by adopting hot materials.
10. The construction method according to claim 7, wherein: in the step S5, in the rolling, when the thickness of the worn thin layer is 1.0-1.5cm, 2 times of static pressure is adopted to complete compaction;
when the thickness of the wearing thin layer is 2.0-3.0cm, the initial pressure adopts forward vibration and backward static pressure, and the combined pressure and the final pressure are totally static pressure for 2 times.
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CN113882284A (en) * 2021-11-05 2022-01-04 西安市灞桥市政设施养护管理有限公司 High-toughness mute thin layer cover maintenance construction method for urban road and bridge
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CN115029986A (en) * 2022-08-15 2022-09-09 中铁建电气化局集团第三工程有限公司 Ultrathin overlay construction method
CN115180874A (en) * 2022-05-31 2022-10-14 北京路通鑫缘工程技术发展有限公司 Water-blocking thin-layer asphalt mixture and preparation method and use method thereof
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CN113882284A (en) * 2021-11-05 2022-01-04 西安市灞桥市政设施养护管理有限公司 High-toughness mute thin layer cover maintenance construction method for urban road and bridge
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CN114180886A (en) * 2021-12-24 2022-03-15 上海浦东路桥(集团)有限公司 Self-adhesive asphalt concrete and preparation method and construction process thereof
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CN115029986A (en) * 2022-08-15 2022-09-09 中铁建电气化局集团第三工程有限公司 Ultrathin overlay construction method
CN117024040A (en) * 2023-08-17 2023-11-10 保利长大工程有限公司 High-performance drainage asphalt mixture and drainage pavement paving method thereof

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